rollup.config.js

import path from 'path';
import json from '@rollup/plugin-json';
import resolvePlugin from '@rollup/plugin-node-resolve';
import ts from 'rollup-plugin-typescript2';
// 根据环境变量中的target属性 获取对应模块中的package.json

const packagesDir = path.resolve(__dirname, 'packages')
const packageDir = path.resolve(packagesDir, process.env.TARGET)

const resolve = (p) => path.resolve(packageDir, p)

// 找到package.json文件
const pkg = require(resolve('package.json'))


const name = path.basename(packageDir)


// 对打包类型，做一个映射表，根据每个包提供给的formats进行格式化需要打包的内容

const outputConfig = {
  'esm-bundler': {
    file: resolve(`dist/${name}.esm-bundler.js`),
    format: 'es'
  },
  'cjs': {
    file: resolve(`dist/${name}.cjs.js`),
    format: 'cjs'
  },
  'global': {
    file: resolve(`dist/${name}.global.js`),
    format: 'iife' //立即执行函数
  }
}

const options = pkg.buildOptions; //package.json中的自定义的配置


function createConfig(format, output) {
  output.name = options.name
  output.sourcemap = true //生成sourcemap
  console.log('output', output)
  // 生成rollup的配置
  return {
    input: resolve(`src/index.ts`),
    output,
    //插件
    plugins: [
      json(),
      ts({ //ts插件
        tsconfig: path.resolve(__dirname, 'tsconfig.json')
      }),
      resolvePlugin() //解析第三方插件模块
    ]
  }
}

export default options.formats.map(format => createConfig(format, outputConfig[format]))